1221210201011 has 4 divisors (see below), whose sum is σ = 1222227030024. Its totient is φ = 1220193372000.

The previous prime is 1221210200993. The next prime is 1221210201047. The reversal of 1221210201011 is 1101020121221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221210201011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221210201091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 508412705 + ... + 508415106.

It is an arithmetic number, because the mean of its divisors is an integer number (305556757506).

Almost surely, 2^{1221210201011} is an apocalyptic number.

1221210201011 is a deficient number, since it is larger than the sum of its proper divisors (1016829013).

1221210201011 is a wasteful number, since it uses less digits than its factorization.

1221210201011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1016829012.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1221210201011 its reverse (1101020121221), we get a palindrome (2322230322232).

The spelling of 1221210201011 in words is "one trillion, two hundred twenty-one billion, two hundred ten million, two hundred one thousand, eleven".